I agree with some shrinkage but 10%?
1. Compacting should be done in stages as the pond is built. Not sure how you would compact the whole dam from the top. I would ask for clarification here.
2. I don't know what a soil dispersant is. ANYBODY?
Shrinkage is different based on type of equipment used. A dozer does not pack as well as a tractor and scraper. Usual estimates for a dozer is around 15%. A tractor and scraper is about 5%. Have built several ponds with a tractor and scraper and experienced no shrinkage but also lots of experience in moving dirt. It also depends on the quality and moisture content of the dirt.
